Super! Thanks for the advice - looking at the contents, that seemed to be what to do, but I wanted to be sure.
These machines are great, and worth the expense! The only thing I noticed is that applying a redstone current to one of them will also apply that current to adjacent blocks - a bonus if you want to warm up a few machines with one switch, but a drawback if you like to manage power more carefully. In the end, I spaced them between non-redstone machines like the Recycler and Canner.